First slide

Water Pollution and its Control

Question

Sewage drainage into water bodies results in

Easy

A

increase in BOD and DO
B

decrease in BOD and DO
C

decrease in BOD and increase in DO
D

increase in BOD and decrease in DO

Solution

Micro-organisms involved in biodegradation of organic matter in the sewage body consume a lot of oxygen. This results in an increase in BOD and a sharp decline in dissolved oxygen (DO) downstream from the point of sewage discharge.

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